hey man i got that same strain from harborside like 2 months ago, marker said sour flower --SSH Bx2-- i'm sure its just made up name.
shes in week 3 of flower right now, and all i can say is get on that training early she WILL stretch, more than you think, hell mine is still stretching everyday.
In terms of genetics i'd guess shes pretty similar to SSH. Might just be a good cut but at 3 weeks shes got the most trichomes, even compared to 6 week flo and my GDP i flipped at the same time.
how many weeks did they tell you?